Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a484a3fe5eacdb9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 05:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de252ecda2d86323aa46c77f611039c7 SHA-1: 89ed4978859c4faafef65317ea2aa3d01711ecbf SHA-256: 9a484a3fe5eacdb95fe0883fa9989c4cd3f6d472af66a040e6af3e26864ebef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ijjp8naj50jr8mo9b40jjf5qo2/10447110954.pdf In PDF document text
    • http://cwesp.biz/upload/file/firegovewudajalepivenexik.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160821f9ef1bdc---87111484257.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/wumesoselogor.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/88677306001.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/tusikajoburipalixam.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/41172186239.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7518f7ddbe7b42d646f544be9d26abda/vasawate.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/89638925388.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/33733156568.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/gukidokevuzuj.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/fifilemuxu.pdfIn PDF document text
    • http://cf-solutions.org/app/webroot/fckeditor/editor/filemanager/connectors/php/imgmedia/nomumepapa.pdfIn PDF document text
    • https://actorconseil.com/files/file/dukupiwebirawivezupoture.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af91984514d---lokuwivivugo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6ed44a37---wosed.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a82498c482e---joviwivoxeve.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/dojabubefasagij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d265d47956b---tanigakanixu.pdfIn PDF document text
    • http://santeh.md/img/files/xulogivikugudojadipa.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3b5eac757---novebejosujazagomamatigud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=meningitis+por+haemophilus+influenzae+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10D 11100 bytes
SHA-256: 1f445326e435a31003a304e55b052b8ba016e4de06f41199a4432b7e4cd55dc1
font_01_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16932 bytes
SHA-256: 497f0848de817d8ca34799eafcac6d923ca20fc079bad8f4006ca44352fb3d3e

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